- A
OSPFv3 will not form adjacencies because the router-id must be an IPv6 address.
Why wrong: OSPFv3 router-id is a 32-bit number in dotted-decimal format, not an IPv6 address. 4.4.4.4 is a valid router-id.
- B
OSPFv3 will only form adjacency on GigabitEthernet0/0 because the router-id is not configured under the interface.
Why wrong: The router-id is configured globally under the OSPFv3 process, which is sufficient. It does not need to be per-interface.
- C
OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface.
The configuration is correct: router-id is set, interfaces are enabled for OSPFv3 in area 0. OSPFv3 will operate normally.
- D
OSPFv3 will not form any adjacency because the network type is not specified.
Why wrong: The default network type for Ethernet interfaces is broadcast, which is fine for OSPFv3. No explicit network type is required.
Quick Answer
The answer is that OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface. This configuration works because OSPFv3, unlike OSPFv2, cannot automatically derive a router-id from an IPv4 interface address; it must be explicitly configured under the OSPFv3 process with the router-id command, or it will fail to start. In this case, the router-id 4.4.4.4 is manually defined, and both GigabitEthernet interfaces have ipv6 ospf 1 area 0 enabled, allowing OSPFv3 to form neighbor relationships over IPv6. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding that a missing or invalid router-id is a common misconfiguration trap—many candidates assume OSPFv3 will auto-select an IPv4 address, but it does not. A helpful memory tip: “OSPFv3 needs a manual ID, or OSPF won’t proceed.”
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Consider the following partial configuration on router R4:
interface GigabitEthernet0/0 ip address 192.168.2.1 255.255.255.0
ipv6 address 2001:db8:1::1/64 ipv6 ospf 1 area 0 !
interface GigabitEthernet0/1 ip address 10.0.0.1 255.255.255.0
ipv6 address 2001:db8:2::1/64 ipv6 ospf 1 area 0 ! ipv6 router ospf 1 router-id 4.4.4.4
What is the effect of this configuration?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface.
The configuration enables OSPFv3 on both interfaces using the ipv6 ospf command. However, OSPFv3 requires a router-id to be set; here it is set to 4.4.4.4. Without a router-id, OSPFv3 will not start. The configuration is valid and OSPFv3 will form adjacencies on both interfaces.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPFv3 will not form adjacencies because the router-id must be an IPv6 address.
Why it's wrong here
OSPFv3 router-id is a 32-bit number in dotted-decimal format, not an IPv6 address. 4.4.4.4 is a valid router-id.
- ✗
OSPFv3 will only form adjacency on GigabitEthernet0/0 because the router-id is not configured under the interface.
Why it's wrong here
The router-id is configured globally under the OSPFv3 process, which is sufficient. It does not need to be per-interface.
- ✓
OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface.
Why this is correct
The configuration is correct: router-id is set, interfaces are enabled for OSPFv3 in area 0. OSPFv3 will operate normally.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
OSPFv3 will not form any adjacency because the network type is not specified.
Why it's wrong here
The default network type for Ethernet interfaces is broadcast, which is fine for OSPFv3. No explicit network type is required.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface. — The configuration enables OSPFv3 on both interfaces using the ipv6 ospf command. However, OSPFv3 requires a router-id to be set; here it is set to 4.4.4.4. Without a router-id, OSPFv3 will not start. The configuration is valid and OSPFv3 will form adjacencies on both interfaces.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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